Normal Light Runes need a Starstone along with a Blank Rune; a Silver Ingot and three Weak Light Runes to make one Normal Light Rune.
Normal Runes can be crafted at level ten at the Rune Altar.
You need three of these to learn Light Slash and you will need extra to cast the spell.
The command to make a Normal Light Rune is [nya!rpg rune altar light]. For more info use [nya!info normal light rune].